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What is this Steel shape?

What is this Steel shape?

What is this Steel shape?

(OP)
I was inspecting a prefab metal building the other day and came across a mezzanine floor that was framed with 12" deep x 2" wide "C" shapes. These are not metal stud (cold formed), and they aren't in the AISC steel book. They are hot rolled (?) and are about 3/16" thick. I have attached a photo. what is the generic category of this type of steel shape and where would I look for design specification?

I have seen this "type" of steel most commonly used on metal building girts. I saw some the other day used in a precast hybrid concrete panel (3" thick panel with 6" studs at 24" on center).

I just have never used this stuff and would like to start.

RE: What is this Steel shape?

No photo.

I think you are describing 'stair channels'.

Mike Halloran
Pembroke Pines, FL, USA

RE: What is this Steel shape?

Bigmig:
They could be a break formed section, depending upon their length , by the PEMB manuf’er., in their own shop. They could be a proprietary rolled shape done for the PEMB manuf’er., by a mill. A section that they use fairly often for several different things, and in sufficient quantity that they can afford the set-up costs for a mill run. There are many proprietary sections out there. They pay for the special set of rolls or combine several existing rolls in the mills inventory; then they have to pay for set-up and buy in sufficient quantity to induce the mill to do the special rolling for them. Maybe they get a special price from one supplier on 3/16" coil stock, and then can design around a constant thickness section. I suspect that in that thickness, that stock could be slit and then cold rolled in a secondary processing shop. I think you should try to get the info. you need directly from the PEMB manuf’er., because you will at least need the thickness, other dimensions, and a mat’l. spec. and properties.

RE: What is this Steel shape?

If they are hot rolled, the outside corners will be relatively sharp, but if cold formed, they will be rounded. Agree with BA that they sound most like a miscellaneous channel used for stair stringers, but a MC 12x10.6 is only 1.5" wide.

RE: What is this Steel shape?

There is a new Misc. Channel in the AISC manual that is close to your shape. AISC-14th edition has a MC12x14.3 (d=12" bf=2.12, tf=0.313, tw=0.25). I can not speak to availability, but I would think it would be more available than a custom-rolled shape

RE: What is this Steel shape?

Not sure, but it looks like it has lipped flanges, which would make it a cold formed CEE purlin shape. I doubt that it would be 3/16" thick, though.

RE: What is this Steel shape?

3ga is almost 1/4", 7ga is .179",
therefore 7ga (alomst 3/16") CEE seems to be what you have. Probably not off the shelf item.

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